The Fuji Clean system treats wastewater through a process of contact filtration, flow equalization and recirculation, all within one tank consisting of three sequential chambers, “Sedimentation,” “Anaerobic” and “Aerobic.” Influent first enters the Sedimentation Chamber, where sludge settles to the bottom, scum and grease float to the top and the relatively clear liquid in the middle flows through a baffle into the bottom of the 2nd chamber, the Anaerobic Chamber. In the Anaerobic Chamber, plastic media sandwiched in the middle within a horizontal plastic grate provides for upflow physical filtration as well as surface area on which anaerobic microbe colonies live and decompose organic matter and denitrify nitrates. Filtered flow from the upper portion of the Anaerobic Chamber then flows into the 3rd chamber, the oxygen rich Aerobic Chamber where two different types plastic media provide surface area for aerobic microbe digestion activity, additional solids filtration and nitrification of ammonicac nitrogens to nitrates. Oxygen is introduced into the sides of this chamber from one linear diaphragm blower. Air from this same blower is also used to power a recirculation loop where an airlift pipe pulls mixed liquor from the sloped bottom center of the aeration chamber and recirculates it 24/7, in a controlled manner, back to the sedimentation chamber. Finally, air from this same blower powers an effluent airlift line that meters cleaned effluent to a final settling zone before gravity discharge. Airlift pipes and flow-through ports are all positioned for natural flow equalization during processing, thus providing maximum residence time for optimal treatment.